Electrical resistance device.



0; MARX. ELECTRICAL RESISTANCE DEVICE. APPLICATION FILED DEC. 17, 19091,058,687. Patented Apr. 8, 1913.

UNITED STATES PATENT OFFICE. GUSTAVE C. CFIELIZABETH, NEW JERSEY,ASSIGNOB. TO DIEI-IL MANUFAC- TURING COMPANY, A CORPORATION OF NEW JERSEY.

ELECTRICAL RESISTANCE DEVICE.

To all whom may concern Be it known that I, GUSTAVE C. MARX, a

' citizen 'of' the United States, residing at Elizabeth, in the countyof Union and State of New Jersey, have invented certain new and usefulImprovements in Electrical Resistance Devices, of which the following isa specification, reference being had therein to the accompanyingdrawings.

In connection with the employment 'of electric propeller fans forventilating purposes requiring interchangeability at certain times, andparticularly in connection workmen in charge of the cars.

The present invention consists in the devices herein shown and describedand recited-in the appended claims for accomplishing these objects.

In the accompanying drawings, Figure 1 is a side elevation of anelectric fan provided with the present improvements, and

Fig.2 a sectional side elevation of a resistance coil and its means ofconnection to the fan motor; F1g. 3 1s a sectional view of thecylindrical housing of the resistance coil, representing the inner endof the same; and Fig. 4 is a transverse sectional view of the cylindershowing the guard-plate at the outer end of the'resistance coil.

The fan is constructed as usual with a motor-frame 1 in which isjournaled the armature-shaft 2 carrying .the fan-blades 3, andispivotally mounted by means of screws 4 in the yoke 6, which has adepending stud having the nut 8 by means of which it is adjustablysecured within a suit ably socketed lug 10 extending from the bracket11, which latter isprovided with means for securing it to a suitablesupport.

Attached to the back of the motor-frame by means of screws 32 abracket-piece to which is secured by means of rivets 34' or VSpecification of Letters Patent.

mated A r. 8,1913.

Application filed December 17, 1909. Serial No. 533,644.

otherwise the metallic housing cylinder 35 for the resistance coil. Thiscylinder is shown open at one end and closed at the other end by meansof a disk 36 having a central 'boss 37 through which passes the threadedend portion of the resistance coil supporting stud or spindle 38arranged in axial relation with the cylinder The disk 36 may be securedin the end of the cylinder 35 by means of screws'39 or by any othersuitable means, and it is shown formed in its inner face with an annularchannel 40 in which are secured the spring contactplates 41, by means ofconducting screwbolts 42 passing through the disk 36 and having upontheir outer threaded ends the clamp-nuts 43 between which are securedthe bared ends of the insulating conducting wires forming a part of thesystem of wiring. The disk 36 carrying the relatively insulated contactpoints or members 42 thus constitutes an insulated support for theresistance coil sustained by the stud. or spindle 38.

The resistance coils herein shown are in the form of insulated spools ofthe class well known commercially in the art and each comprising a coilof wire of low conductivity wound upon a tubular insulating arbor andhaving leading therefrom at in tervals, as represented in Fig. 2,connecting wires 44 leading to suitable contact studs; the sectionalresistance coil thus formed having molded thereon a covering 45 ofporcelain.

As shown in Fig. 2, the cover 45 has at its inner end a centralperforated disk 46 of insulating material, preferably formed separatelyfrom the covering 45 and of less brittle material, such asfiber, throughwhich pass a series of preferably soft copper contact studs 47corresponding in number and arrangement with the contact plates 41 ofthe disk 36, and having apertures entered by the ends of the connectingwires 44 mechanically secured in position therein by pinching the endsof the studs 47 ,thereon.'

, The heads 48 of the studs 47 normally rest in contact with the flatouter ends of the contact plates 41.

The resistance coil has at its opposite end a central perforatedsteadying guide-plate 49 of insulating material, the plates 46 and 49being firmly secured upon the ends of the resistance coil between thehead 38 of the .the stud 38 is removably securedavithin its aperture inthe disk by means of the nut 51 whose position determines the degree ofpressure between the contact-plates 40 and the heads 48 of theconducting studs 47. The guide-plate 49 is made comparatively narrow, asrepresented in Fig. 4 to afford apertures on opposite sides to permitthe free circulation of air through the housing 85 to insure againstoverheating of the resistance coil. The cylinder is provided upon itsinner wall with a longitudinal rib 35* formed by indenting the side ofthe cylinder, and to this rib are fitted correspondingly shaped notches52 and in the insulating disks 46 and 49, whereby the contact studs 47are guided and maintained in proper relation with the spring contactplates 41.

The motor bracket 11 is shown provided with aconnection box 54 which isin practice connected with conductor wires from the source of supply andfrom which are led the wire 55 directly to one of the motor terminalsand a series of wires 56 each leading to one of the terminal screw-bolts42 of the resistancecoil housing.

Vhile it is preferable to form the disk 36 constituting the end of theresistance coil housing cylinder, and the plates 46 and 49, all ofporcelain, especially when the mem bers 46 and 49 are made integral withthe insulating covering of the resistance coils, it will be understoodthat these several insulating parts may be made of any suitablematerials, so long as the live members for v conducting current carriedthereby are suitably insulated.

The resistance coils are supplied for application to the fan-motor withthe stud or spindle 38 between the head 3S and nut 50 of which areclamped the coil 45 with its end plates 46 and 49, the former carryingthe contact-studs 4'7 permanently connected with the ends of theconductor wires 44. In

renewing the coil, therefore, it is merely nec essary for the attendantto remove the nut 51 from the stud 38 of the previously used resistancecoil, Withdraw the latter from the open end of the housing cylinder orcasing 35 and introduce a new coil to be secured in position byapplication of the nut 51.

As represented in Fig.2, the housing cylinder 35 is provided in the sidewalls with perforations Z35 to facilitate the circulation of air aroundthe resistance coil.

It is evident that, while the embodiment herein shown and described ispreferable, the present improvement is susceptible of considerablemodification in the specific construction and arrangement of itscomponentparts without departure from the presentinvention.

Having thus set forth the nature of the invention, what I claim hereinis:

1. The combination. with a support provided with a plurality ofrelatively insulated contact-points having means of attachment toelectric-current conductor-wires, of a sectional resistance coil havinga member carrying a plurality of relatively insulated contact-points towhich its sections are respectively connected, and means for removablysecuring said resistance coil to said support with its contact-pointseach in electrical connection with one of those of the support.

2. The combination with a support pro vided with a plurality' ofrelatively insulated contact-points having means of attachment toelectric-current conductor-wires, of a sec tional resistance coil havinga member carrying a plurality of relatively insulated contact-points towhich its sections are rcspectively connected, means for rcmovablysecuring said resistance coil to said support, and an interposedyielding connection between each of the contact-points of saidresistance coil and a corresponding contact point of the support.

3. The combination with a support provided with a plurality ofrelatively insulated contact-points having means of attachment toelectric-current conductor-wires, ofa sectional resistance coil in theform of a spool with an insulating covering of heat-resisting materialand a disk at one end composed of non-fusible insulating materialcarrying a plurality of contact-points connected respectively with theseveral sections of the resistance coil, and means for rcmovablysecuring said resistance coil to said support withits contactpoints inelectrical connection with those of the support.

4. The combination with a housing having side-walls and a centrallyapertured end provided with a plurality of contactpoints having means ofattachment to electric-current conductor-wires, of a sectionalresistance coil in the form of a spool having end flanges loosely fittedto the side walls of said housing, contact-studs carried by one of saidflanges in substantially the. arrangement of and adapted for electricalconnection with the contact-points of the housing and connectedrespectively with the sections of said coil, and a longitudinallydisposed supporting stud for said resistance coil entering the aperturein the end of the housing and detachably secured therein.

5. The combination with a cylindrical housing having a longitudinalguide-rib upon its inner wall and a centrally apertured end providedwith a plurality of contact-points having means of attachment toelectric-current conductor-wires, of a sectional resistance coil'in theform of a spool having end flanges loosely fitted to the walls of saidhousing and peripherally notched to embrace said guide-rib,contact-studs carried by one of said flanges and adapted for electricalconnection with the contact-points of the cylinder-end and connectedrespectively with the sections of said coil, and a central supportingstud for said resistance coil entering and detachably secured within theaperture in the end. of the housing.

6. The combination with a cylindrical housing having a longitudinalguide-rib upon its inner wall and a centrally apertured end providedwith a plurality of contactpoints having means of attachment toelectric-current conductor-wires, of a sectional resistance coil in theform of a spool having end flanges loosely fitted to the walls of saidhousing and peripherally notched to embrace said guide-rib, one of saidflanges being narrower thanthe housing to afford ventilating aperturesfor the latter, contactstuds carried by the other of said flanges andadapted for electrical connection with the contact-points of thecylinder-end and connected respectively with the sections of said 0011,and a central supporting stud for said resistance coil entering anddetachably secured within the aperture in the end of the housing.

7 The combination with a housing having side-walls and an end providedwith a central aperture and carrying a plurality of contact-studs havingmeans of attachment to electric-current conductor-wires, and springcontact-plates secured by means of said studs to the inner face of theend of the housing, of a sectional resistance coil in the form of aspool having end flanges loosely fitted to the side-walls of saidhousing, contact-studs carried by one of said flanges in substantiallythe arrangement of said spring contactplates with which they arenormally in contact and connected respectively with the sections of saidcoil', a central supporting stud for said resistance coil entering theaperture in the end of said housing, and means for detachably securingthe same to the end of the housing.

8. The combination with a housing proadded with a plurality ofcontact-points, a

sectional resistance coil-having a plurality of contact-points to whichits sections are respectively connected, means whereby said resistancecoil is removably secured within said housing, interposed yieldingconnections between the contact-points of said coilhousing open at oneend and having the other end closed by a disk of insulating material, aplurality of contact-bolts passing through said insulating disk andprovided upon the outer face ofthe same with means for securingconductors thereto, a spring contact member attached to theinnerend ofeach'of said contact-bolts, a sectional resistance coil in the form of aspool having end flanges, contact-studs carried by one of said flangesin substantially the arrangement of the spring contact members of thecylinderend and connected respectively with the sec-i tions of saidcoil, and means for detachably securing said resistancecoil within thehousing with said contact studs inengagement with the respectivespringcontact members of thecylinder-end.

10. The combination with a housing perinanently openfor the freecirculation of air,-

and provided with a plurality of contactpoints, of a sectionalresistance coil having a plurality of contact points to which itssections are respectively connected, means whereby said resistance coilis removably secured within said housing with its contact- -points inelectrical connection with those of said housing, and means whereby thecontact-points of the housing may be connected two subscribingwitnesses;

GUSTAVE O. MARX.

Witnesses:

HENRY A. KORNEMANN, HENRYJ. MILLER.

'90 with a source of current supply and a cur-

